The twitter site of the military's U.S. Central Command was taken over Monday by hackers claiming to be working on behalf of the Islamic State militants. American and coalition fighters are launching airstrikes against IS in Iraq and Syria.

U.S. Secretary of State John Kerry arrived in Pakistan on Monday to press the country's leadership to step up the fight against extremists and eliminate safe havens for terror groups along the Afghan border.

With Tom Brady, Aaron Rodgers and Russell Wilson headed to the NFL's conference title games, this is the first time in 21 years — and only second time ever — that three of the final four teams are quarterbacked by a Super Bowl champion.